Tough one, my old stanbyes are Stiff Little Fingers, The Ruts and Social Distortion but Id recommend some of these who are a bit more obscure. The Jam and The Clash also.

I think the UK Subs were the ultimate punk band

From britain look for X Ray Spex, Penetration, 999, Wire, The Lurkers (English version of the Ramones), The Skids, The Mekons, Cockney Rejects early stuff before they went metal
From Ireland well Northern Ireland The Starjets, Rudi, The Undertones
US I recommend the Los Angeles scene around the time of The Germs, lots of groups with good song or 2
Washington DC time around Minor Threat time

As I think of more I will post

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Wire is possibly my favorite band of all time, but I really need to catch up on the rest of the British scene. Thanks for the suggestions!